Contribution to a conference proceedings/Journal Article

PUBDB-2025-00520

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Laser-free and low-jitter Electro-Optic Sampling of FEL-based THz radiation by intrinsic ultrafast laserlike-pulses at FLASH

Gang, S.-g.DESY* ; Jung, E.DESY* ; Matlis, N.CFEL*DESY* ; Stojanovic, N.Extern* ; Pan, R. (Corresponding author)DESY*

2025
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.infrared.2025.106121  doi:10.3204/PUBDB-2025-00520

Abstract: The FLASH1 THz beamline at DESY produces intense multicycle THz undulator radiation, along with quasi-single cycle edge radiation. Characterizing the temporal profile of THz radiation generated by free-electron lasers (FELs) is challenging due to unavoidable timing jitter between the THz pulse and an external laser synchronized to the FEL master clock. Although Electro-Optic Sampling (EOS) is a powerful diagnostic technique for the FEL THz sources, this jitter limits the temporal resolution and spectral bandwidth, necessitating timing jitter correction. To address this, we introduce a laser-free and low-jitter diagnostic method, Afterburner EOS (ABEOS), which uses broadband laserlike-pulses generated with the THz radiation as a probe. ABEOS results demonstrate good consistency with simulations across two probe configurations: a sequence of 10 pulses and a single pulse. Furthermore, comparisons with conventional methods of scanning EOS with an external laser, single-shot EOS (SSEOS), and FTIR show strong and reliable agreement. This technique offers ’laser-free and low-jitter’ THz waveform characterization as a simplified, accurate, and reliable alternative to conventional THz diagnostics, validated up to 2 THz with potential for application at higher frequencies.

Note: Dr. Ulrike Frühling at FLASH served as an internal reviewer for the manuscript, and the review report is attached.Submission deadline is by 01.02.2025.

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Contributing Institute(s):

1. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)
2. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASH THz Undulator Beamline (FLASH)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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